staging: comedi: Prefer using BIT macro in various files.

Challenge suggested by coccinelle.

Replace bit shifting on 1 with the BIT(x) macro.
Coccinelle script:

@@
constant c;
@@

-(1 << c)
+BIT(c)
Signed-off-by: Sanjana Sanikommu <sanjana99reddy99@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/amplc_pci230.c

@@ -2464,7 +2464,7 @@ static int pci230_auto_attach(struct comedi_device *dev,
 	devpriv->adcg = 0;
 	devpriv->adccon = PCI230_ADC_TRIG_NONE | PCI230_ADC_IM_SE |
 			  PCI230_ADC_IR_BIP;
-	outw(1 << 0, devpriv->daqio + PCI230_ADCEN);
+	outw(BIT(0), devpriv->daqio + PCI230_ADCEN);
 	outw(devpriv->adcg, devpriv->daqio + PCI230_ADCG);
 	outw(devpriv->adccon | PCI230_ADC_FIFO_RESET,
 	     devpriv->daqio + PCI230_ADCCON);

drivers/staging/comedi/drivers/das08.c

@@ -236,9 +236,9 @@ static int das08_ai_insn_read(struct comedi_device *dev,
 			 * COMEDI 16-bit bipolar data value for 0V is 0x8000.
 			 */
 			if (msb & 0x80)
-				data[n] = (1 << 15) + magnitude;
+				data[n] = BIT(15) + magnitude;
 			else
-				data[n] = (1 << 15) - magnitude;
+				data[n] = BIT(15) - magnitude;
 		} else {
 			dev_err(dev->class_dev, "bug! unknown ai encoding\n");
 			return -1;

drivers/staging/comedi/drivers/dyna_pci10xx.c

@@ -54,7 +54,7 @@ static int dyna_pci10xx_ai_eoc(struct comedi_device *dev,
 	unsigned int status;
 
 	status = inw_p(dev->iobase);
-	if (status & (1 << 15))
+	if (status & BIT(15))
 		return 0;
 	return -EBUSY;
 }

drivers/staging/comedi/drivers/ni_at_ao.c

@@ -244,7 +244,7 @@ static int atao_calib_insn_write(struct comedi_device *dev,
 
 		/* write the channel and last data value to the caldac */
 		/* clock the bitstring to the caldac; MSB -> LSB */
-		for (bit = 1 << 10; bit; bit >>= 1) {
+		for (bit = BIT(10); bit; bit >>= 1) {
 			bits = (bit & bitstring) ? ATAO_CFG2_SDATA : 0;
 
 			outw(bits, dev->iobase + ATAO_CFG2_REG);

drivers/staging/comedi/drivers/ni_daq_700.c

@@ -239,7 +239,7 @@ static int daq700_auto_attach(struct comedi_device *dev,
 	s->type = COMEDI_SUBD_AI;
 	s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_DIFF;
 	s->n_chan = 16;
-	s->maxdata = (1 << 12) - 1;
+	s->maxdata = BIT(12) - 1;
 	s->range_table = &range_daq700_ai;
 	s->insn_read = daq700_ai_rinsn;
 	daq700_ai_config(dev, s);

drivers/staging/comedi/drivers/ni_mio_common.c

@@ -4800,7 +4800,7 @@ static int cs5529_do_conversion(struct comedi_device *dev,
 	if (data) {
 		*data = ni_ao_win_inw(dev, NI67XX_CAL_DATA_REG);
 		/* cs5529 returns 16 bit signed data in bipolar mode */
-		*data ^= (1 << 15);
+		*data ^= BIT(15);
 	}
 	return 0;
 }
@@ -6209,7 +6209,7 @@ static int ni_E_init(struct comedi_device *dev,
 		s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_INTERNAL;
 		/*  one channel for each analog output channel */
 		s->n_chan = board->n_aochan;
-		s->maxdata = (1 << 16) - 1;
+		s->maxdata = BIT(16) - 1;
 		s->range_table = &range_unknown;	/* XXX */
 		s->insn_read = cs5529_ai_insn_read;
 		s->insn_config = NULL;